All applications, illustrations and technical information detailed on this site have been assembled based on the latest information available. While every precaution has been taken in the compilation of this information, NGK Spark Plug (Australia) Pty Ltd takes no responsibility for inaccuracies that may occur within it.

Product linkage to vehicles or equipment from this publication are considered under normal conditions of use, fitted by a professional.

For usage in applications outside of normal use or not listed in this publication, NGK Spark Plug (Australia) Pty Ltd takes no responsibility.

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Spark Plug Cross Reference

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Cross reference guide

To find the correct NGK equivalent, please enter the non-NGK part number in the box below...

Note: This cross-reference is a guide only and may not be suitable for all vehicles. Please refer to our application listings for full details.

NTK Oxygen Sensors

NTK is the world’s largest manufacturer of oxygen sensors. NTK Oxygen Sensors are designed to maintain optimal fuel efficiency and are supplied with a direct-fit connector similar to those used by the OEM manufacturer for easy installation.

Every NTK Oxygen Sensor undergoes a complex three test process, including long life, high temperature & anti poisoning, to guarantee high quality and durability. As future emissions standards become tougher, NTK is further developing oxygen sensor technologies to help provide cleaner, more efficient engines.

NTK Oxygen Sensors

NTK is the world’s largest manufacturer of oxygen sensors. NTK Oxygen Sensors are designed to maintain optimal fuel efficiency and are supplied with a direct-fit connector

similar to those used by the OEM manufacturer for easy installation.

Every NTK Oxygen Sensor undergoes a complex three test process, including long life, high temperature & anti poisoning, to guarantee high quality and durability. As future emissions standards become tougher, NTK is further developing oxygen sensor technologies to help provide cleaner, more efficient engines.

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What is an Oxygen Sensor?

An oxygen sensor continually detects the oxygen content in the exhaust gases of an engine. The oxygen sensor output signal informs the vehicle’s ECU (Electronic Control Unit) whether the AFR (Air-Fuel Ratio) is lean or rich. Based on this, the ECU adjusts the amount of fuel injected into the engine to achieve an optimal AFR.

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NTK Different Oxygen Sensors

NTK manufacture three different types of oxygen sensors:

TITANIA OXYGEN SENSORS

Vary in resistance based on the amount of oxygen in the exhaust gas.

ZIRCONIA OXYGEN SENSORS

Produce a voltage which varies based on the amount of oxygen in the exhaust gas.

Both Zirconia and Titania oxygen sensor types are produced with different numbers of wires to satisfy different needs, although it is critical to note that due to their different properties Zirconia and Titania sensors should not be interchanged under any circumstance.

AIR FUEL RATIO SENSORS

Exhaust gas enters the air/fuel ratio sensors measuring cell through porous diffusion channels. In the cell, the oxygen density is measured by means of electrodes and compared with that of stoichiometric.

The sensor signal wire is directly connected to one of the platinum electrodes on the ceramic element. The sensor output is immune to ground loop voltages and also to large resistances in the vehicle ground return, caused by corroded connections. No NTK four wire sensor is case grounded. Case grounded sensors have the ground wire physically attached to the sensor body.

It is not recommended to replace isolated ground sensors with case ground types.

Zirconia

Details

Zirconia

One wire is the sensor signal, one is the isolated sensor signal ground and the remaining two are used to supply a voltage to the internal heater.

The sensor signal wire is directly connected to one of the platinum electrodes on the ceramic element. The sensor output is immune to ground loop voltages and also to large resistances in the vehicle ground return, caused by corroded connections. No NTK four wire sensor is case grounded. Case grounded sensors have the ground wire physically attached to the sensor body.

It is not recommended to replace isolated ground sensors with case ground types.

The sensor signal wire is directly connected to one of the platinum electrodes on the ceramic element. The sensor output is immune to ground loop voltages and also to large resistances in the vehicle ground return, caused by corroded connections. No NTK four wire sensor is case grounded. Case grounded sensors have the ground wire physically attached to the sensor body.

It is not recommended to replace isolated ground sensors with case ground types.

The sensor signal wire is directly connected to one of the platinum electrodes on the ceramic element. The sensor output is immune to ground loop voltages and also to large resistances in the vehicle ground return, caused by corroded connections. No NTK four wire sensor is case grounded. Case grounded sensors have the ground wire physically attached to the sensor body.

It is not recommended to replace isolated ground sensors with case ground types.